Gomez trails the seasoned congressman in the polls but said he would run again in 2014 if defeated.

“It’s a clear choice between me and Congressman Markey,” Gomez said. “He’s had 37 years to prove that he can do this, and he’s not succeeded in that mission. I’m mission-focused.”

The political newcomer said he believes in gay marriage, supports immigration reform and acknowledges global warming, whereas Markey has “never had a history of reaching across the aisle.”

“I am for the immigration reform bill,” Gomez said. “I want to make that group…right now, it’s a group of eight, I want to make it a gang of nine, and I hope Sen. [Elizabeth] Warren joins me and makes it a gang of ten.”

Longshot Republican candidate Gabriel Gomez, a venture capitalist and former Navy SEAL, said Sunday that "I'll succeed in this mission" of defeating Massachusetts Rep. Ed Markey for a Senate seat.
Gomez and Markey face off Tuesday in a special election to fill former Sen....